Condensation

The vapour package provides access to the basic read functions available in GDALfor both raster and a vector data sources.

The functions are deliberately lower-level than these data models and provide access to the
component entities independently.

For vector data vapour provides:

• read access to feature attributes.
• read access to raw binary geometry.
• read access to geometry in text forms (GeoJSON, WKT, GML, KML).
• read access to the extent, or bounding box, of feature geometries.

All vector/feature read tasks can optionally apply
OGRSQL to a layer prior to data extraction.

For raster data vapour provides:

• read access to the list of available rasters within a collection source (subdatasets).
• read access to structural metadata for individual raster sources.
• read access for raw data using GDAL's RasterIO framework and its dynamic image decimation / replication resampling algorithms.

The workflows available are intended to support development of applications in R for these vector and raster data without being constrained to any particular data model.